critics tell us they've found some serious flaws in this technology. if the flaws aren't fixed could create security and safety concerns at airports around the country. >>> 471, 107. >> reporter: the new system called nextgen is expected to become fully operational by 2020. it is a complex system of air traffic control that will out satellite based technology similar to the gps you use in your car rather than the ground based tracking systems to more efficiently control tracking throughout the air and the united states. nextgen is being used on a trial basis in the bay area. earlier this year faa acting administrator michael wharfta shows off the technology. >> what we wanted people to understand is nextgen is right now. there are things that we are doing that are improving the use of the air space that will result in a lot of benefit right away. >> reporter: while the benefits of these technological changes may come in time, several different sources worry about security flaws now. >> i'm he not the only one out there that has access to this informati